Method of producing lithium sulfide

Abstract

Provided is a more appropriate method of producing lithium sulfide having high ionic conductivity and no by-products generated. The method of producing lithium sulfide includes a temperature rising step (Step S14) of reducing lithium sulfate fed into a furnace in a state of heating to a temperature of more than 700° C. under an atmosphere of a reduced pressure of 0.05 MPa or less.

1 . A method of producing lithium sulfide, the method comprising:
 a temperature rising step of reducing lithium sulfate fed into a furnace in a state of heating to a temperature of more than 700° C. under an atmosphere of a reduced pressure of 0.05 MPa or less.   
     
     
         2 . The method of producing lithium sulfide according to  claim 1 , wherein the temperature rising step is performed by heating to 750° C. or more and 1,000° C. or less in a state where lithium sulfate and a reducing agent are mixed. 
     
     
         3 . The method of producing lithium sulfide according to  claim 2 , wherein the temperature rising step is performed by heating to 850° C. or more and 950° C. or less in the state where lithium sulfate and the reducing agent are mixed. 
     
     
         4 . The method of producing lithium sulfide according to  claim 1 , further comprising a preparation step of feeding lithium sulfate and a reducing agent into the furnace.